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The action potential Depolarization Repolarization Reestablishing resting potential + + + Nat Na+ K* Kt + + membrane (mV) A stimulus at this time causes a quick rise in membrane potential. membrane (mV) The membrane potential drops rapidly, overshooting its initial value. Δν Δν, Δν, membrane (mV) Diffusion of ions reestablishes the +40- +40- +40- -t (ms) 3 t (ms) 3 resting potential. t (ms) 3 2. 2 1 -70- -70- -70- A cell depolarizes when a stimulus causes the opening of the sodium channels. The concentration of sodium ions is much higher the cell drives these ions out of the cell. The outside the cell, so positive sodium ions flow into the cell, rapidly raising its potential to 40 mV, at which point the The reestablishment of the rest- ing potential after the sodium and potassium channels close is a relatively slow process controlled by the motion of ions across the membrane. The cell repolarizes as the potassium channels open. The higher potassium concentration inside potassium channels close when the membrane potential reaches about -80 mV, slightly less than the resting potential. sodium channels close.

The action potential Depolarization Repolarization Reestablishing resting potential + + + Nat Na+ K* Kt + + membrane (mV) A stimulus at this time causes a quick rise in membrane potential. membrane (mV) The membrane potential drops rapidly, overshooting its initial value. Δν Δν, Δν, membrane (mV) Diffusion of ions reestablishes the +40- +40- +40- -t (ms) 3 t (ms) 3 resting potential. t (ms) 3 2. 2 1 -70- -70- -70- A cell depolarizes when a stimulus causes the opening of the sodium channels. The concentration of sodium ions is much higher the cell drives these ions out of the cell. The outside the cell, so positive sodium ions flow into the cell, rapidly raising its potential to 40 mV, at which point the The reestablishment of the rest- ing potential after the sodium and potassium channels close is a relatively slow process controlled by the motion of ions across the membrane. The cell repolarizes as the potassium channels open. The higher potassium concentration inside potassium channels close when the membrane potential reaches about -80 mV, slightly less than the resting potential. sodium channels close.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A 9.0-nm-thick cell membrane undergoes an action potential that follows the curve in the table given. What is the strength of the electric field inside the membrane just before the action potential and at the peak of the depolarization?

The action potential Depolarization Repolarization Reestablishing resting potential + + + Nat Na+ K* Kt + + membrane (mV) A stimulus at this time causes a quick rise in membrane potential. membrane (mV) The membrane potential drops rapidly, overshooting its initial value. Δν Δν, Δν, membrane (mV) Diffusion of ions reestablishes the +40- +40- +40- -t (ms) 3 t (ms) 3 resting potential. t (ms) 3 2. 2 1 -70- -70- -70- A cell depolarizes when a stimulus causes the opening of the sodium channels. The concentration of sodium ions is much higher the cell drives these ions out of the cell. The outside the cell, so positive sodium ions flow into the cell, rapidly raising its potential to 40 mV, at which point the The reestablishment of the rest- ing potential after the sodium and potassium channels close is a relatively slow process controlled by the motion of ions across the membrane. The cell repolarizes as the potassium channels open. The higher potassium concentration inside potassium channels close when the membrane potential reaches about -80 mV, slightly less than the resting potential. sodium channels close.
Transcribed Image Text:The action potential Depolarization Repolarization Reestablishing resting potential + + + Nat Na+ K* Kt + + membrane (mV) A stimulus at this time causes a quick rise in membrane potential. membrane (mV) The membrane potential drops rapidly, overshooting its initial value. Δν Δν, Δν, membrane (mV) Diffusion of ions reestablishes the +40- +40- +40- -t (ms) 3 t (ms) 3 resting potential. t (ms) 3 2. 2 1 -70- -70- -70- A cell depolarizes when a stimulus causes the opening of the sodium channels. The concentration of sodium ions is much higher the cell drives these ions out of the cell. The outside the cell, so positive sodium ions flow into the cell, rapidly raising its potential to 40 mV, at which point the The reestablishment of the rest- ing potential after the sodium and potassium channels close is a relatively slow process controlled by the motion of ions across the membrane. The cell repolarizes as the potassium channels open. The higher potassium concentration inside potassium channels close when the membrane potential reaches about -80 mV, slightly less than the resting potential. sodium channels close.
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